connect(cell1, finish).
connect(cell1, cell2).
connect(cell2, cell7).
connect(cell7, cell12).
connect(cell7, cell8).
connect(cell8, cell9).
connect(cell9, cell14).
connect(cell11, cell16).
connect(cell11, cell12).
connect(cell14, cell15).
connect(cell15, cell20).
connect(cell16, cell21).
connect(cell20, cell25).
connect(cell21, cell22).
connect(cell22, cell23).
connect(cell23, cell24).
connect(cell24, cell25).
connect(start, cell25).